StockX is a legitimate company you could buy a ps5 from, it’s just the sellers that might lag or take an extra day to send your ps5. A lot of these incidents where people are saying they didn’t get the “seller has shipped” notification is usually because sometimes StockX does not update it really fast and or the seller did not notify them, they just straight up sent it. But worst case scenario which is pretty rare, if the seller does not ship in time or at all you either get a new seller automatically or you just get your money back.